ProxySQL: Uninitialized heap read in MySQL compressed packet decompression via zlib path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102664
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 21:17:41 UTC
Updated2026-11-09 17:17:05 UTC
DescriptionProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Prior to 3.0.10, 3.1.10, and 4.0.10, decompress_mysql_payload() in lib/mysql_data_stream.cpp accepts a zlib stream when uncompress() returns Z_OK without checking that the actual output length equals the attacker-controlled payload_length. An authenticated MySQL client that negotiates compression can overstate payload_length, causing buffer2array() to parse the uninitialized tail of a heap buffer as MySQL packet headers and forward stale data to the backend. Backend error responses can disclose prior SQL queries, result data, credentials, or session state, and malformed lengths can also cause excessive allocations. This issue is fixed in versions 3.0.10, 3.1.10, and 4.0.10.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

EPSS: 0.003000000 probability, percentile 0.229480000 (date 2026-11-09)

Problem Types: CWE-908 | CWE-908 CWE-908: Use of Uninitialized Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sysown Proxysql affected < 3.0.10 Not specified
CNA Sysown Proxysql affected >= 3.1.0, < 3.1.10 Not specified
CNA Sysown Proxysql affected >= 4.0.0, < 4.0.10 Not specified

References

ReferenceSourceLinkTags
github.com/sysown/proxysql/commit/396c742f7d50b1f479e1157e296ee9d0aff1b724 [email protected] github.com
github.com/sysown/proxysql/releases/tag/v3.0.10 [email protected] github.com
github.com/sysown/proxysql/security/advisories/GHSA-fvch-fpgq-pwfx [email protected] github.com
github.com/sysown/proxysql/commit/a8c1cef4d44c4beea7f6aa21b8a09a7cb8c75520 [email protected] github.com
github.com/sysown/proxysql/releases/tag/v4.0.10 [email protected] github.com
github.com/sysown/proxysql/releases/tag/v3.1.10 [email protected] github.com
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